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fabs(3M)

HP-UX 11i Version 3: February 2007
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NAME

fabs(), fabsf(), fabsl(), fabsw(), fabsq() — absolute value functions

SYNOPSIS

#include <math.h>

double fabs(double x);

float fabsf(float x);

HP Integrity Server Only

long double fabsl(long double x);

extended fabsw(extended x);

quad fabsq(quad x);

DESCRIPTION

The fabs() function returns the absolute value of x, |x|.

fabsf() is a float version of fabs(); it takes a float argument and returns a float result.

Integrity Server Only

fabsl() is a long double version of fabs(); it takes a long double argument and returns a long double result.

fabsw() is an extended version of fabs(); it takes an extended argument and returns an extended result.

fabsq() is equivalent to fabsl() on HP-UX systems.

USAGE

To use fabsf(), compile either with the default -Ae option or with the -Aa option. For PA-RISC only, the -D_HPUX_SOURCE option must be used along with the -Aa option.

To use (for Integrity servers) fabsl(), fabsw(), or fabsq(), compile either with the default -Ae option or with the -Aa and -D_HPUX_SOURCE options. To use fabsw() or fabsq(), compile with the -fpwidetypes option.

To use these functions, make sure your program includes <math.h>, and link in the math library by specifying -lm on the compiler or linker command line.

For more information, see the HP-UX floating-point guide for HP Integrity servers at the following site: http://www.hp.com/go/fp.

RETURN VALUE

If x is ±INFINITY, fabs() returns +INFINITY.

If x is NaN, fabs() returns NaN.

These functions raise no exceptions.

ERRORS

No errors are defined.

STANDARDS CONFORMANCE

fabs() : SVID3, XPG4.2, ANSI C, ISO/IEC C99 (including Annex F, "IEC 60559 floating-point arithmetic")

fabsf(), fabsl() : ISO/IEC C99 (including Annex F, "IEC 60559 floating-point arithmetic")

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